How do I get my order email (that gets sent to the customer) back to what it was before. All of a sudden the email that gets sent to the customer is not in the HTML format anymore. It seems to have changed to a non-html format.

I recall installing some add-ons a while back but because I only noticed that the customer's email was not in the HTML format quite some time after I actually installed the add-ons I can't seem to find which page may have been overridden and can't find what I might have changed.

Any ideas where to look to find where the HTML email is called after a customer completes an order.